Nonreadable carbon paper



Oct. 27, 1931. c J, A K 1,829,250

NONREADABLE CARBON PAPER Filed June 25. 1930 In venfor Crawfard 1 ka/ker;

142 tor/1 eyo.

Patented Oct. 27, 1931 v UNITED STATES PATENT OFFICE CRAWFORD JQWALKER,OI INDIANAPOLIS, INDIANA, ASSIGNOR TO THE PBOTICTU CORPORATION, 01INDIANAPOLIS, INDIANA NONREADABLE Application filed June 28,

This invention relates to the art of carbon paper, and particularly tomeans for concealing from new characters; impressed upon a second sheetthrough the paper. In machine bookkeeping method as described in my S.application for patent filed April 7, 1930, Serial Number 442,090, acarbon sheet is employed in part to cause an impression to be madethereby on a second sheet upon an impression being made on a firstsheet, and in part to conceal from the operators view an impression madedirectly through the carbon paper on a art of the carbon paper andsecond sheet w ich may pro ect beyond the side of the first sheet. Thecharacters impressed on that projecting second sheet through theheretofore employed carbon paper were easily read on the upper oruncoated side of the carbon paper even though the paper be black incolor.

My invention provides a carbon sheet so formed that characters impresseddirectly thereon can not be read, and what is printed ona second sheetthereunder through the carbon paper can only be ascertained by liftingthe carbon paper therefrom to render the second sheet visible.

The single view in the drawing shows the obverse side of a sheet ofcarbon paper embodying my invention.

The sheet 10 is processed in the customary manner well known'to thoseversed in the art to form the copying or coated reverse side 11. On theobverse side, I provide a blind surface here shown as arranged in thetwo columns 12 and 13, one toward each vertical edge. This surface isproduced by printing on the sheet the resultant design as produced byarranging horizontal rows 14 of non-consecutive letters across verticalrows 15 of non-consecutive letters of the alphabet. I employ all uppercase letters and it is essential in both the horizontal and verticalrows that there be no spacing between the individual letters in adjacentrows above or below or on either side. Any letters or signs impressedupon this resultant design are entirely blended into the maze of linesso that it is impossible to read or de- CARIBON PAPER 1880. Serial No.468,010.

termine by observation, what letters or-signs were impressed.

letters of the alphabet, so that there is the additional confuslon oflines introduced when figures are impressed upon the crossed rows ofletters.

I claim: 1. A paper for preventing the reading of characters impressedthereon including a transferring medium on one side, and on the other aplurality of lines produced by horizontal and vertical rows of up ercase letters of an alphabet, the letters 1n each row being adjacent theletters of the next row..

2. A paper for preventing the reading of characters impressed thereonincluding a transferring medium on one side, and on the other aplurality of lines produced by horizontal and vertical rows of uppercase letters of an alphabet, the letters in each row being adjacent theletters of the next row the background of said surface being lighterthan the said lines.

3. A' non-readable carbon paper having a transferring medium on thereverse side, and a plurality of upper case letters of an alphabet onthe obverse side, said letters being arranged in crossed rows with theletters in each row substantially contacting with the letters in theadjacent rows and one another.

4. A non-readable carbon paper having a transferring medium on thereverse side, and a plurality of upper case letters ofan alphabet on theobverse side, said letters being arranged in crossed rows with theletters in each row substantially contacting with the letters in theadjacent rows and one another, said letters in each row being innon-consecutive order.

5. A non-readable carbon paper having a transferring medium on thereverse side, and a plurality of upper case letters of an al- '2 mamphabet onthe obverse side, said letters being I arranged in crossed rowswith the letters in each row substantially contacting with the lettersin the adjacent rows and one another,

5 said obverse side being lighter in color than the lettersthereon.

.6. ,Ainon-readable copyin paper having a transferring medium on t 0reverse side and a plurality of characters onthe obverse 1. side, saidcharacters being imprinted one s over the other, the upper charactersbeing angularly disposed in reference to the under characters. 7 a r 7.A paper for the prevention of the read- 15 ing of wnting impressedthereon-having a plurality of characters imprinted thereon 1njuxtaposition one over the other, each overlying character beingangularly disposedin relation to-the under characters.

-In testimony whereof I aflix my. signature.

CRAWFORD J. WALKER.

an I

